Spasemunki writes "The New York Times reports here on the success in Japan of an RF-based, cash replacement smart card developed by Sony. Used primarily by Japan's largest railway company, the cards carry a declining cash balance (no link to your credit card or bank account if it is lost or stolen), and conducts transactions at railway turnstiles in 1/5 of a second. Mass transit remains one of the big areas for many folks where you just can't live without cash- this would be a big improvement over digging in the couch for exact change ... "
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